#
# fusion.db.node_id
#
# Copyright 2008 Helsinki Institute for Information Technology
# and the authors.
#
# Authors: Ken Rimey <rimey@hiit.fi>
#

# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import with_statement

import os
from hashlib import sha1
from binascii import hexlify
from tempfile import gettempdir

def get_node_id(db_path):
    return sha1(get_machine_id() + db_path).hexdigest()[:20]

def get_machine_id():
    filename = os.path.join(gettempdir(), 'org.p2p-fusion.machine-id')
    try:
        with open(filename, 'r') as f:
            return f.read()
    except IOError:
        id = hexlify(os.urandom(10))
        with open(filename, 'w') as f:
            f.write(id)
        return id
